The impact of membrane type and electrolyte composition for the electrochemical generation of synthesis gas (CO + H2) using an electrolysis cell containing a Ag gas diffusion cathode is presented. Changing from a cation exchange membrane to an anion exchange membrane extended the cell operational time at low cell voltages (Ecell) without impacting product composition. The use of KOH as the catholyte decreased the Ecell and resulted in a minimum electrolyte cost reduction of 34%. The prime factor in determining operational time at low Ecell was the ability to maintain a sufficiently high anolyte pH.
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Dufek et al. (2012) studied this question.
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